Method of breaking sinter cake during sintering



Oct. 2l, 1952 w. KELsr-:Y 2,614,920

METHOD OF' BREAKING SINTER CAKE DURING SINTERING Filed Aug. a. 195o IN V EN TOR.

Patented Oct. 2l, 1952 mii o p l l" UNITED L STATES PATENT OFFICE ME'rnon oF BRIMKINGV siN'rER CAKE :DURING SINTERINGj Walter Kelsey, New York, NQ Y. I Applicaticnnugust s, 195o, seria1 No. `17s,195

1:, `This invention relates to a method of breaking sinter during the sintering ofsinter stock to sinter.

In my pending application Serial No.`147,317, led March 2, 1950, I have featured ajsloping sinter pass with steps at intervals forcing the flow' of burning sinter to drop from step to step whereby a continual breaking of the iiow of sinter takes place during the formation of sinter. The claimed subject matter in that application is for a mechanism. The subject matter of this application is for a method. l A

The sinter stock and sinter in a sloped gravity ow sinterpass is continually under pressure with al1 pieces and particles within themass in intimatecontact, the iiow of `sinter being controlled by the rate of withdrawal i the sinter from the bottomof the pass, butat no time in operation will the withdrawal of the sinter exceed the replacement `by'sinter stock, or "fully release the pressure Within the gravity flow sinter pass. o

All sintering machines and processes in practical use, up to the present time,4 are based on the idea that the burning stage of the process must be carried on without any motion between pieces or particles within the mass of such sinter stock. According to this invention the whole mass of sinter stock and sinter being subjected in the ow to a cross draft of air to maintain combustion, has the sinteri'stock and sinter subjected at spaced intervals to a shifting of the flowing sinter and sinter 'stock with the fire line between the sinter stock and sinter being ,continually under pressure for maintaining an intimate contact between al1 pieces" and particles in the owing mass. This intimate contact of pieces and particles maintained by pressure perL mits the formation of sinter whilethere is a relative motion between pieces and vparticles in the sinter stock mass. Y A

In accordance with the invention, the sinter is formed in layers and each layer is broken into theparticles in the mass is keptat aminimum by the now control gate at the bottom of the sinter pass combined with the` shearing displacement of the mass of Lflowing sinter stock and sinter at intervals. This breaks up the formation of any long `ranged internal disturbing flow caused by theunevenresistances to ow between the "top and bottom restraining surfaces. The successive and repeated cracking of the sinter layers results in crevices in the sinter for the air ow in addition to Athat `passing through the porous sintenfllfiis process will give a higher production of sinterlthan any process at present inuse. o

In the accompanying diagrammatic drawings used to explain the operation of this method of sintering,

Fig. l is a diagrammatic cross section drawing of the sinter stockland sinter mass assumed as taken out of and free of the sinter pass for a go better understanding of the invention;

Fig. 2 is a sectional side `view showing the shearing action on the sinter stock and on the rst sinter layer;

Fig. 3 isa# side viewof a gravity flow sinter pass with the sinter stockand sinter layers therein, showing its movement downward in the sinter pass, and showing the formation of added layers of broken sinter mass; and f Fig.14 is a top view of thel sinter pass showing the spaced rollers and the restraining top surface.

Similar characters of reference indicate corresponding 'parts throughout the drawings.

Referring to the drawings, Fig. 1 is a section at l--l ofrFig'. 4 vshowing the sinter stockwand sinter only of the sinter pass, and brings out the application of the shearing forcesA applied to the sinter andthe reacting forces B and C. The force A is applied to the formed layer of sinter inisuch an amount and in such a' direction as to displaceand shear off the newly formed layer of sinter E rI-his displacement is the same as the height of the step `at the shearing line or zone. i The force A is opposed by a reacting force B exerted by the restrained sinterstocl; resting on the edge of `the step 4 The sinter stock is restrained by the inclosing surfaces of the sinter pass and the pressurefrom the Weightof the sinter material above, acting on the "materials atthe said shearing zone. The

vforce Cfexerted by the unbalanced forces A and B is carried through the sinter and is absorbed by the weight pf the sintertr is taken up by the top perforatedv restraining plate A(not shown in Fig.` l). "-Thereacting force B compresses the sinter stock in the shearing zone below and at the sinter layer displaced or sheared oi is reacted by an opposite force in the sinter stock exerted against the bottom of the part of the layer of sinter remaining in place, the unbalanced force in the shearing action being absorbed by the weight of the layer of sinter remaining in place or is carried to the restraining sinter pass top through said sinter layer.

The improved method contemplates subjecting sinter cake to a breaking up, while it is being formed by the burning of sinter stock, below it, then forming another sinter cake below the agglomeration of broken cake above the remaining sinter stock, and subjecting said newly formed sinter cake and broken sinter cake, to a breaking action while above the sinter stock and while the same is burning, and repeating said actions until the entire sinter stock is converted to broken sinter.

I have described the improved method with the aid of certain means but such means may be varied within the confines of the principle underlying the foregoing method which is applicable to other than the gravity sinter passes. j

This is a continuation in part of my pending 6 application Serial No. 147,317, filed March 2, 1950, for Sintering Machines, in that this application is for a method of which one mechanical embodiment is shown in the pending application.

I claim: The method of converting a flow of stock flowing by gravity in an inclined direction into broken sinter, which consists in burning a iirst layer of the flow of stock to a first layer of sinter above the stock, subjecting said first sinter layer to a breaking into sinter parts above the remainconverted to sinter layers and into broken sinter,

whereby the flow of stock is completely converted into broken sinter.

WALTER KELSEY.

No references cited. 

